Push-rod for delivery-valves of internal-combustion engines.



P. KRON. n PUSH BOD FOR DELIVERY VALVES OI INTERNAL COMBUSTION ENGINES.

APPLIOATIOH IILED D30. 14, 1908.

Patented May 16, 1911.

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v To all whom it concern: v A

UNITED: STATES PATENT oFFicE.

PAUL new, or LEYALLOIS-PERRET, FRANCE.

PUSH-BOD FOB DELIVERY VALVES OF INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented May 16,1911.

Application filed December 14, 1908. Serial No. 467,449.

Be it known that 1, PAUL KR6N, of 7 Rue Collange, in Levallois-Perret,Seine, Republic of France, engineer, have invented a Push-Rod forDelivery-Valves of Internal- Combustion Engines, of which the followingis a full,clear, and exact description.

The valves of internal combustion engines operated mechanically aregenerally lifted by meansof an intermediate device interposed betweenthe cam mounted upon theclearance when the motor is started, the

valve will no longer bear upon its seat and the motor willno longeroperate when the expansion occurs. The clearance left between thehead ofthe push rod and the tail of the valve however is of great disadvantagewhen it is desired to obtain a machine the operation of which must be asnoiseless as possible. Indeed, the push rod moving at a great speed,when the thrust of the cam takes place, it bears suddenly'against thetail of. the valve thereby producing asomewhat loud noise which isrepeated a con siderable number of times in a second. Furthermore theimpactof the push rod upon the stem of the valve causes a rapid wear ofthese parts.

The present invention has for its purpose to remedy these disadvantagesand consists in a push-rod or plunger for operating a delivery valvearranged in such manner as to avoid clearance between this push-rod andthe valve.

"In the present invention the movable r serving to operate the valve isdivided in two parts which are maintained constantly applied on thevalve rod and the operating valve by means of a suitably arrangedspring, the contact between the two parts of the push-rod is effectedwithin a closed chamber and in an oil bath which is automaticallyfedbetweenthe contact surfaces by the displacement of the two parts ofsaid push rod.

The accompanying drawing shows by way of example in vertical section apush rod, arranged according to thelprinciple of the invention.

As shown in this drawing, this form of push-rod comprises a stationarycasing or guide a in which can slide two metallic pieces 6 and 0 formingthe push rod properly called. The piece 6 which forms the valveactuating member of the push rod carries at its upper part an adjustableabutment (2 and is provided at its lower part with a central rod b whichcan slide in a socket c with which the piece 0 is provided. The latterpiece forms the tappet member of the push rod and is provided at itslower part with a friction-roller e mounted on a pin 6'. The member I)of the push rod, at its junction with its central rod 6 forms a shoulderor abutment adapted to be engaged by the upper end of the member 0 whichforms a cooperating abutment. The contact surfaces of the two metallicpieces 6 and c are maintained apart the one from the other by a coilspring f which constantly presses the piece I) against the rod 9 of thevalve and the piece 0 againstthe cam h. As shown in the drawing themembers I) and 0, have reduced portions which form with the'casing orguide 'a closed chamber containing oil 73. The coil spring f is alsocontained in this chamber. The oil is automatically fed to the spacebetween the contact surfaces of the pieces I) and c, the displacement ofthese two pieces 6 and c act- 'ing as a pump. For the most effectiveoperation of the apparatus thus arranged, it is necessary for the camwhich operates the inlet valve to have a special outline giving a muchgreater lift than the one which is required with the ordinary push-rods,so as to permit of lifting successively the two pieces 6 and c. v

The operation of the apparatus is as follows: The cam h in turningbegins to lift the piece 0 which slides in the casing or guide a untilthe socket'c' meets the lower of thls push-rod effecting the suddenmotions is very light. On the other hand, the oil cushion i interposedbetween the pieces I) and 0 considerably deadens the shock producedbetween the pieces I) and c and as the shock takes place within a closedvessel no noise can be transmitted to the outside.

.The above arrangements have been given by way of'example; the forms,dimensions and detail arrangements can va according to circumstanceswithout mo ifying the principle of the invention.

1. A valve actuating rod comprising an up er and a lower member, and acasing in which the said members extend, the lower member fitting at itslower end in the lower part of said casing and having a reduced upperportion provided with a central socket, the upper member fitting at itsupper end in said casing and having a reduced lower portioncorresponding with the reduced portion of the lower member, the adjacentends of said reduced portions forming coiiperating contact surfaces, acentral rod extending from the reduced portion of the upper member andengaging the socket in the lower member, the reduced portions of saidmembers forming with the casing a chamber surrounding the contactsurfaces and containing oil, the oil fillin the space between thecontact surfaces 0 the members, when said contact surfaces areseparated.

2. A valve actuating rod comprising two members telescopically engagingeach other and having coiiperating shoulders or abutments, a casing inwhich the members extend, the said members he cut away to form with thecasing a cham for oil surrounding the said members and normallycommunicating near its upper end with a space between the said shouldersor abutments, the oil being drawn from said chamber upon the se arationof said shoulders or abutments to the said ace between the same, and aspring in sa1d chamber and hearing at its ends against the respectivemembers to separate the said shoulders or.

- abutments.

friction roller for engagement with a cam,

the tappet member having an impact surface, a valve actuating" memberhaving a surface adapted to receive the impact of said tappet memberandto be operated thereby, the said members telescoplcally engaging eachother, the valve actuating member hav- 'in an adjustable abutment forengagementwlth the valve rod, a casing forming a guide in which the saidmembers extend, the said members having reduced portions forming annularshoulders in alinement with eachother, the said reduced ortions formingwith the casing a chamber containing a lubricant, the lubricantsurrounding the surfaces of said members which come in contact, forcushioning their impact, and a coil spring arranged in said chamber andengaging the shoulders on said members to hold the same constantly incontact with the said cam and the said valve rod.

. 4. A valve operating rod comprising two members telescopicallyengaging each other 8 5 and having cocperating contact surfaces, acasing in which -said members extend, the said members having reducedortions forming annular shoulders in a ement with each'other, the saidreduced portions forming with the casing a chamber containing alubricant, and a spring in said chamber surrounding the membersat thereduced portion thereof, and bearing on the annular shoulders of saidmembers.

5. A valve actuating rod comprising a tappet member and a valveactuating memher, the said members havin cooperating contact surfaces,the said v ve actuating member having a screw threaded socket in itsupper end, and-an abutment member for 100 engagement with the rod of thevalve to be actuated and ha a stem ad ustable 1n said socket, a casing mwhich the members extend, the said members ha reduced portions formingwith the c a chamber'for a cushioning material an a spring arranged insaid chamber and engaging said members. I 6. valve operating rod,conglpr smg a tappet member provide with a re uced portion forming anannular shoulder, the sa1d reduced ortion having a central openmg, and avaiive operating member having a reduced portion forming an annularshoulder in alinement with the shoulder on the ta pet 115 tend, thereduced portions of said members forming with the casing an annularchamber surrounding\ the reduced portions of said members, t c saidchamber containing oil adapted to fill the space between the contact 130surfaces of the members when the latter are rod for delivery valve ofinternal combusseparated to cushion the impact of said surtion enginessigned by me this 1st day of faces, and a coil spring in said chambersur- December 1908.

-rounding the reduced portions of said mem- V V. PAUL KRON.

5 bers and engaging the alin'ed shoulders on Witnesses:

said members. i H. G. Coxn,

The foregoing specification of my push MAURICE H. Pram.

